1. Storage
When storing the sight glass prior to installation, the following conditions shall be met:

1.1 In a covered area free from dust.
1.2 The sight glass shall either be stored in their original packaging or stood on shelves, or in clean boxes free of any contamination, which could damage the lining. The flange protectors should be left in place at all time when in storage.
1.3 When the original packing is used for storage, care should be taken to avoid excessive stacking of the boxes.
The packing cases should be handled by means of trucks, pallet trucks belts or chains. The use of hooks, which may pierce the packing and damage the valve linings, should be avoided.

2. Installation and Start-up Conditions.

2.1 Before installing the sight glass in the pipeline, drain and clean the mating flanges to avoid damaging the sight glass by swarf, grit, weld splatter etc.
a) Remove the plastic flange protectors.
b) Check that the sight glass internals appear clean and free from obvious contamination.
c) Clean, and if necessary blow-dry with clean air, the inside of the sight glass.
d) Clean the mating faces of the sight glass and the pipe with appropriate solvents.3. Maintenance & Repair.

Owing to their design, KLSGB bulls eye sight glass do not require any routine maintenance.
Important: decontamination.
Because KLSGB bulls eye sight glass are likely to be handling corrosive or hazardous liquids, it is important that the sight glass is fully decontaminated prior to dismantling, and that it is free from any residual vapour.
Do not use steam to decontaminate the valves.

3.1. Maintenance Area.
Maintenance of the KLSGB bulls eye sight glass should be carried out on a clean working surface, free of dust, swarf, or other particles, which could damage the PFA lining and or the Borosilicate glass tube.
It should be maintained in a clean state.

3.2. Tooling.
No special tools are required for the maintenance of KLSGB bulls eye sight glass. Operators will require a set of spanners and hexagon type keys for dismantling the valves and a torque wrench to set the body bolts at the correct torque on re-assembly.


4. Dismantling.

a) Place the sight glass on a clean surface.
b) Loosen and remove bolts
c) Remove the glass retaining flanges
d) Remove gaskets
e) Remove Borosilicate glass circles.

5. Assembly.

a) Place all the parts on a clean surface.
b) Insert gaskets into retaining flanges
c) Insert Borosilicate glass circles into retaining flanges
d) Carefully locate the retaining flanges (complete with glass and gaskets) onto the sight glass body
e) Tighten body bolts in an even cross tightening sequence with a torque wrench
(as shown in table 1.)

Table 1.  Type KLSGB Body Bolt Tightening Torques
Size Dimensions Torques Nm
1" 4 x M12 20
1.5" 4 x M16 30
2" 4 x M16 30
3" 4 x M16 40
4" 8 x M16 50

6. Testing.
Following maintenance an air test should be carried out for all the sight glasses.
Recommended test pressures:
3 minutes at 10 bar (for sizes 1” to 4”)
3 minutes at 6 bar (for sizes 6” to 8”)

7. Protection.
Following testing fit the plastic flange protectors to protect the lining. Flange protectors should be fitted at all times in storage and should be removed only when the sight glass is installed into the pipeline.

8. Condition of Spare Parts.
When overhauling Kenway type KLSGB bulls eye sight glass, only parts in good condition should be used. Any parts showing evidence of cuts, scratches, abrasions or deformation, which may be detrimental to the performance of the sight glass, should be rejected.

9. Guarantee.
As described above, the overhaul of the Kenway type KLSGB bulls eye sight glass is a simple process. However, it should be carried out by skilled personnel experienced in such operations. Site maintenance shall be carried out under the sole control of the site personnel, and shall not be the responsibility of Kenway (Valves) UK Ltd.

10. Contacts.
For original replacement parts or if you have any technical questions, please contact our sales staff on.
Tel: 01509 508131       Fax: 01509 505485      Email: sales@kenwayvalves.co.uk